A 21-year-old man accused of causing a crash that killed an El Paso police officer in 2010 was convicted Thursday of manslaughter, aggravated assault and driving while intoxicated.

Alejandro Fierro now faces two to 20 years in prison for each manslaughter and aggravated assault charge, and up to 180 days in jail for the DWI charge. He is eligible for probation.

After the verdict was read, 120th District Judge Maria Salas-Mendoza revoked Fierro's bond and remanded him into custody.

State prosecutors had alleged Fierro was driving drunk when he crashed into a patrol car driven by Officer Ricardo Lopez just before 1 a.m. on Oct. 13, 2010, at the intersection of Zaragoza Road and Saul Kleinfeld Drive. Lopez's partner and passenger, Officer Karl McDonough, died at the scene.

Defense attorney Josh Herrera said he was "pleased with the verdict. The verdict from the jury says they don't believe intoxication was the sole cause of this accident. There were other contributing factors."

A defense expert witness testified Wednesday that the crash might have been Lopez's fault, and said his investigation found Lopez might have been driving nearly 80 mph and probably ran the red light at Zaragoza Road, while Fierro was driving east on Saul Kleinfeld Drive.

Before closing arguments Thursday morning, Lopez took the stand as a surprise witness for the state. Lopez testified he was passionate about police work and was in "perfect health" before the crash.

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Lopez testified that on the night of the crash, McDonough asked him to stop at a Valero gas station near Zaragoza and Saul Kleinfeld so that he could buy his favorite flavor of Slurpee.

While at the store, the officers received a call about a possibly intoxicated driver on George Dieter Drive and Pendale Road. Lopez testified he remembers coming to the intersection on Zaragoza Road at a red light, then the light turned green. Before proceeding, he grabbed McDonough by the neck and told him, "I love you, brother."

Lopez said he didn't see any traffic on Saul Kleinfeld Drive before entering the intersection.

During closing arguments, defense attorney Dolph Quijano told jurors they needed to determine whether Fierro's intoxication caused the crash before convicting him of either intoxicated manslaughter or intoxicated assault.

Quijano also told jurors Fierro might have seemed disoriented and confused at the crash scene because he might have suffered a concussion.

Prosecutors said Fierro was medically cleared by medical personnel at Del Sol Medical Center before an officer administered a sobriety test.

Assistant District Attorney Ray Duke argued Fierro, whose blood alcohol concentration measured at .13 after the crash, was clearly intoxicated and caused the crash by running the right light.

Duke told jurors Fierro's story changed several times that night. Duke pointed to testimony that Fierro initially told two civilian witnesses that he had run a stop sign, then told an officer he had the green light. He then told another officer he had proceeded through the intersection at a yellow light.

Fierro initially told the officer he had one beer -- a Budweiser Select -- at an East Side bar, then changed the amount minutes later to two. He told a second officer he had been drinking at a friend's house and had three or four Corona beers.

"These two officers ... were certainly El Paso's finest," Duke told jurors. "They were doing their job that day. They had our backs. Are we going to have their backs?"